/*
 * @(#)TimeZoneNameProvider.java	1.2 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.util.spi;

import java.util.Locale;

/**
 * An abstract class for service providers that
 * provide localized time zone names for the
 * {@link java.util.TimeZone TimeZone} class.
 * The localized time zone names available from the implementations of
 * this class are also the source for the 
 * {@link java.text.DateFormatSymbols#getZoneStrings() 
 * DateFormatSymbols.getZoneStrings()} method.
 *
 * @since        1.6
 * @version      @(#)TimeZoneNameProvider.java	1.2 05/11/17
 */
public abstract class TimeZoneNameProvider extends LocaleServiceProvider {

    /**
     * Sole constructor.  (For invocation by subclass constructors, typically
     * implicit.)
     */
    protected TimeZoneNameProvider() {
    }

    /**
     * Returns a name for the given time zone ID that's suitable for 
     * presentation to the user in the specified locale. The given time 
     * zone ID is "GMT" or one of the names defined using "Zone" entries 
     * in the "tz database", a public domain time zone database at 
     * <a href="ftp://elsie.nci.nih.gov/pub/">ftp://elsie.nci.nih.gov/pub/</a>. 
     * The data of this database is contained in a file whose name starts with 
     * "tzdata", and the specification of the data format is part of the zic.8 
     * man page, which is contained in a file whose name starts with "tzcode".
     * <p>
     * If <code>daylight</code> is true, the method should return a name 
     * appropriate for daylight saving time even if the specified time zone 
     * has not observed daylight saving time in the past. 
     *
     * @param ID a time zone ID string
     * @param daylight if true, return the daylight saving name.
     * @param style either {@link java.util.TimeZone#LONG TimeZone.LONG} or 
     *    {@link java.util.TimeZone#SHORT TimeZone.SHORT}
     * @param locale the desired locale
     * @return the human-readable name of the given time zone in the 
     *     given locale, or null if it's not available.
     * @exception IllegalArgumentException if <code>style</code> is invalid, 
     *     or <code>locale</code> isn't one of the locales returned from 
     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales() 
     *     getAvailableLocales()}.
     * @exception NullPointerException if <code>ID</code> or <code>locale</code>
     *     is null
     * @see java.util.TimeZone#getDisplayName(boolean, int, java.util.Locale)
     */
    public abstract String getDisplayName(String ID, boolean daylight, int style, Locale locale);
}
